Re: Network Performance Issues.

On Sat, 14 Apr 2007 23:02:17 +0100
Alan Chandler <alan@xxxxxxxxxxxxxxxxxxxxx> wrote:

I have spent all day looking for clues as to how to debug network
performance issues without success. Nobody seems to answered my
previous post on this subject - so I thought I would try again.

The problem I have is this. I have a linux desktop (machine D) siting
on a LAN in my home. This is connected to a linux firewall/nat router
(machine S) with two ethernet cards. One links out to the internet,
the other connects to the internal lan. Connections to the internet
from machine D go through machine S, which acts as a NAT translation. I
do all the control and firewalling using IPTABLES in machine S.

Downloading a video from youtube onto Machine D's desktop I get a
download speed of about 7Kbytes/sec. Which is very low. If I try to
download the same one by ssh'ing into mahcine S and running wget on the
same url, I get a download speed of 80Kbytes/sec (ie more than 10 times
faster).

This would normally imply a bottle neck in the network between machines
D and S. But if I download a similar file from machine S to machine D,
then I get a throughput of about 11Mbytes/sec.

I have do idea about how to debug this and find out what the problem is.
Can someone here give me some clues as to what to do.
--
Alan Chandler
http://www.chandlerfamily.org.uk


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If you're using Iceweasel (i.e. Firefox) to download the Youtube videos then it might be the ipv6 support in Iceweasel messing you around. Try diabling it.

Ananda


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